File:EB1911 Cyanite.jpg

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Description

English: A crystal diagram for cyanite. There is a perfect cleavage parallel to the broad face m (100), and a less perfect one parallel to t (010): the basal plane p (001), oblique to the prism zone, is a gliding plane on which secondary twinning is produced by pressure, giving rise to characteristic horizontal striations on the cleavage face m. The figure represents a crystal twinned on the plane m (100).

Date

published 1911

Source

Encyclopædia Britannica (11th ed.), v. 7, 1911, “Cyanite,” p. 680.

Author

Leonard James Spencer

Permission
(Reusing this file)

This image comes from the 13^th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	16:14, 21 April 2017		347 × 349 (30 KB)	Library Guy	{{Information \|Description ={{en\|1=A crystal diagram for cyanite. There is a perfect cleavage parallel to the broad face ''m'' (100), and a less perfect one parallel to ''t'' (010): the basal plane ''p'' (001), oblique to the prism zone, is a glidin...

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